chr8-42843033-G-A

Variant names:

• chr8-42843033-G-A
• rs1064797344
• NM_018105.3:c.62C>T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_018105.3(THAP1):​c.62C>T​(p.Ser21Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S21C) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: THAP1 NM_018105.3 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 8.29

Genes affected

THAP1 (HGNC:20856): (THAP domain containing 1) The protein encoded by this gene contains a THAP domain, a conserved DNA-binding domain. This protein colocalizes with the apoptosis response protein PAWR/PAR-4 in promyelocytic leukemia (PML) nuclear bodies, and functions as a proapoptotic factor that links PAWR to PML nuclear bodies. Alternatively spliced transcript variants encoding distinct isoforms have been observed. [provided by RefSeq, Jul 2008]

ENSG00000286837 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PM1: In a zinc_finger_region THAP-type (size 80) in uniprot entity THAP1_HUMAN there are 36 pathogenic changes around while only 1 benign (97%) in NM_018105.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.944
• PP5: Variant 8-42843033-G-A is Pathogenic according to our data. Variant chr8-42843033-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 425441.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
THAP1	NM_018105.3	c.62C>T	p.Ser21Phe	missense_variant	Exon 1 of 3	ENST00000254250.7	NP_060575.1
THAP1	NM_199003.2	c.62C>T	p.Ser21Phe	missense_variant	Exon 1 of 2		NP_945354.1
LOC124901940	XR_007060901.1	n.100G>A		non_coding_transcript_exon_variant	Exon 1 of 2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
THAP1	ENST00000254250.7	c.62C>T	p.Ser21Phe	missense_variant	Exon 1 of 3	1	NM_018105.3	ENSP00000254250.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000330 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Torsion dystonia 6 Pathogenic:2

Oct 26, 2016

Mayo Clinic Laboratories, Mayo Clinic

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 06, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces serine, which is neutral and polar, with phenylalanine, which is neutral and non-polar, at codon 21 of the THAP1 protein (p.Ser21Phe). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with clinical features of dystonia (PMID: 24976531, 26610312, 33144682; internal data). ClinVar contains an entry for this variant (Variation ID: 425441). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. This variant disrupts the p.Ser21 amino acid residue in THAP1. Other variant(s) that disrupt this residue have been observed in individuals with THAP1-related conditions (PMID: 19345147, 22377579), which suggests that this may be a clinically significant amino acid residue. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

not provided Pathogenic:1

Jul 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

THAP1: PM1, PM2, PM5, PS4:Moderate -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	32
DANN	Benign	0.97
DEOGEN2	Pathogenic	0.88	D;.;.
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Benign	0.84	T;D;T
M_CAP	Pathogenic	0.81	D
MetaRNN	Pathogenic	0.94	D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.6	H;H;.
PrimateAI	Uncertain	0.69	T
PROVEAN	Uncertain	-3.9	D;D;D
REVEL	Pathogenic	0.98
Sift	Uncertain	0.0010	D;D;D
Sift4G	Uncertain	0.0030	D;D;D
Polyphen		1.0	D;.;D
Vest4		0.91
MVP		0.96
MPC		1.5
ClinPred		1.0	D
GERP RS		4.3
Varity_R		0.95
gMVP		0.81

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1064797344; hg19: chr8-42698176;